/Engine/Source/Runtime/SlateCore/Public/Widgets/SWindow.h
FOverlayPopupLayer ( const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [SWindow](API\Runtime\SlateCore\Widgets\SWindow) > & InitHostWindow, const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [SWidget](API\Runtime\SlateCore\Widgets\SWidget) > & InitPopupContent, [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [SOverlay](API\Runtime\SlateCore\Widgets\SOverlay) > InitOverlay )